bfd/i386os9k.c

   1 /* BFD back-end for os9000 i386 binaries.
   2    Copyright 1990, 1991, 1992, 1993 1994 Free Software Foundation, Inc.
   3    Written by Cygnus Support.
   4
   5 This file is part of BFD, the Binary File Descriptor library.
   6
   7 This program is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2 of the License, or
  10 (at your option) any later version.
  11
  12 This program is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with this program; if not, write to the Free Software
  19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  20
  21
  22 #include "bfd.h"
  23 #include "sysdep.h"
  24 #include "libbfd.h"
  25 #include "bfdlink.h"
  26 #include "libaout.h"            /* BFD a.out internal data structures */
  27 #include "os9k.h"
  28
  29 static bfd_target *os9k_callback PARAMS ((bfd *));
  30
  31 /* Swaps the information in an executable header taken from a raw byte
  32    stream memory image, into the internal exec_header structure.  */
  33 void
  34 DEFUN(os9k_swap_exec_header_in,(abfd, raw_bytes, execp),
  35       bfd *abfd AND
  36       mh_com *raw_bytes AND
  37       struct internal_exec *execp)
  38 {
  39   mh_com *bytes = (mh_com *)raw_bytes;
  40   unsigned int dload, dmemsize, dmemstart;
  41
  42   /* Now fill in fields in the execp, from the bytes in the raw data.  */
  43   execp->a_info   = bfd_h_get_16 (abfd, bytes->m_sync);
  44   execp->a_syms   = 0;
  45   execp->a_entry  = bfd_h_get_32 (abfd, bytes->m_exec);
  46   execp->a_talign = 2;
  47   execp->a_dalign = 2;
  48   execp->a_balign = 2;
  49
  50   dload  = bfd_h_get_32 (abfd, bytes->m_idata);
  51   execp->a_data = dload + 8;
  52
  53   bfd_seek(abfd, (file_ptr)dload, SEEK_SET);
  54   bfd_read(&dmemstart, sizeof(dmemstart), 1, abfd);
  55   bfd_read(&dmemsize, sizeof(dmemsize), 1, abfd);
  56
  57   execp->a_tload  = 0;
  58   execp->a_dload = bfd_h_get_32 (abfd, (unsigned char *)&dmemstart);
  59   execp->a_text = dload - execp->a_tload;
  60   execp->a_data = bfd_h_get_32 (abfd, (unsigned char *)&dmemsize);
  61   execp->a_bss = bfd_h_get_32 (abfd, bytes->m_data) - execp->a_data;
  62
  63   execp->a_trsize = 0;
  64   execp->a_drsize = 0;
  65 }
  66
  67 #if 0
  68 /* Swaps the information in an internal exec header structure into the
  69    supplied buffer ready for writing to disk.  */
  70
  71 PROTO(void, os9k_swap_exec_header_out,
  72           (bfd *abfd,
  73            struct internal_exec *execp,
  74            struct mh_com *raw_bytes));
  75 void
  76 DEFUN(os9k_swap_exec_header_out,(abfd, execp, raw_bytes),
  77      bfd *abfd AND
  78      struct internal_exec *execp AND
  79      mh_com *raw_bytes)
  80 {
  81   mh_com *bytes = (mh_com *)raw_bytes;
  82
  83   /* Now fill in fields in the raw data, from the fields in the exec struct. */
  84   bfd_h_put_32 (abfd, execp->a_info  , bytes->e_info);
  85   bfd_h_put_32 (abfd, execp->a_text  , bytes->e_text);
  86   bfd_h_put_32 (abfd, execp->a_data  , bytes->e_data);
  87   bfd_h_put_32 (abfd, execp->a_bss   , bytes->e_bss);
  88   bfd_h_put_32 (abfd, execp->a_syms  , bytes->e_syms);
  89   bfd_h_put_32 (abfd, execp->a_entry , bytes->e_entry);
  90   bfd_h_put_32 (abfd, execp->a_trsize, bytes->e_trsize);
  91   bfd_h_put_32 (abfd, execp->a_drsize, bytes->e_drsize);
  92   bfd_h_put_32 (abfd, execp->a_tload , bytes->e_tload);
  93   bfd_h_put_32 (abfd, execp->a_dload , bytes->e_dload);
  94   bytes->e_talign[0] = execp->a_talign;
  95   bytes->e_dalign[0] = execp->a_dalign;
  96   bytes->e_balign[0] = execp->a_balign;
  97   bytes->e_relaxable[0] = execp->a_relaxable;
  98 }
  99 #endif 0
 100
 101 static bfd_target *
 102 os9k_object_p (abfd)
 103      bfd *abfd;
 104 {
 105   struct internal_exec anexec;
 106   mh_com exec_bytes;
 107
 108   if (bfd_read ((PTR) &exec_bytes, MHCOM_BYTES_SIZE, 1, abfd)
 109       != MHCOM_BYTES_SIZE) {
 110     bfd_error = wrong_format;
 111     return 0;
 112   }
 113
 114   anexec.a_info = bfd_h_get_16 (abfd, exec_bytes.m_sync);
 115   if (N_BADMAG (anexec)) {
 116     bfd_error = wrong_format;
 117     return 0;
 118   }
 119
 120   os9k_swap_exec_header_in (abfd, &exec_bytes, &anexec);
 121   return aout_32_some_aout_object_p (abfd, &anexec, os9k_callback);
 122 }
 123
 124
 125 /* Finish up the opening of a b.out file for reading.  Fill in all the
 126    fields that are not handled by common code.  */
 127
 128 static bfd_target *
 129 os9k_callback (abfd)
 130      bfd *abfd;
 131 {
 132   struct internal_exec *execp = exec_hdr (abfd);
 133   unsigned long bss_start;
 134
 135   /* Architecture and machine type */
 136   bfd_set_arch_mach(abfd, bfd_arch_i386, 0);
 137
 138   /* The positions of the string table and symbol table.  */
 139   obj_str_filepos (abfd) = 0;
 140   obj_sym_filepos (abfd) = 0;
 141
 142   /* The alignments of the sections */
 143   obj_textsec (abfd)->alignment_power = execp->a_talign;
 144   obj_datasec (abfd)->alignment_power = execp->a_dalign;
 145   obj_bsssec  (abfd)->alignment_power = execp->a_balign;
 146
 147   /* The starting addresses of the sections.  */
 148   obj_textsec (abfd)->vma = execp->a_tload;
 149   obj_datasec (abfd)->vma = execp->a_dload;
 150
 151   /* And reload the sizes, since the aout module zaps them */
 152   obj_textsec (abfd)->_raw_size = execp->a_text;
 153
 154   bss_start = execp->a_dload + execp->a_data; /* BSS = end of data section */
 155   obj_bsssec (abfd)->vma = align_power (bss_start, execp->a_balign);
 156
 157   /* The file positions of the sections */
 158   obj_textsec (abfd)->filepos = execp->a_entry;
 159   obj_datasec (abfd)->filepos = execp->a_dload;
 160
 161   /* The file positions of the relocation info ***
 162   obj_textsec (abfd)->rel_filepos = N_TROFF(*execp);
 163   obj_datasec (abfd)->rel_filepos =  N_DROFF(*execp);
 164   */
 165
 166   adata(abfd).page_size = 1;    /* Not applicable. */
 167   adata(abfd).segment_size = 1; /* Not applicable. */
 168   adata(abfd).exec_bytes_size = MHCOM_BYTES_SIZE;
 169
 170   return abfd->xvec;
 171 }
 172
 173 #if 0
 174 struct bout_data_struct {
 175     struct aoutdata a;
 176     struct internal_exec e;
 177 };
 178
 179 static boolean
 180 os9k_mkobject (abfd)
 181      bfd *abfd;
 182 {
 183   struct bout_data_struct *rawptr;
 184
 185   rawptr = (struct bout_data_struct *) bfd_zalloc (abfd, sizeof (struct bout_data_struct));
 186   if (rawptr == NULL) {
 187       bfd_error = no_memory;
 188       return false;
 189     }
 190
 191   abfd->tdata.bout_data = rawptr;
 192   exec_hdr (abfd) = &rawptr->e;
 193
 194   /* For simplicity's sake we just make all the sections right here. */
 195   obj_textsec (abfd) = (asection *)NULL;
 196   obj_datasec (abfd) = (asection *)NULL;
 197   obj_bsssec (abfd) = (asection *)NULL;
 198
 199   bfd_make_section (abfd, ".text");
 200   bfd_make_section (abfd, ".data");
 201   bfd_make_section (abfd, ".bss");
 202
 203   return true;
 204 }
 205
 206 static boolean
 207 os9k_write_object_contents (abfd)
 208      bfd *abfd;
 209 {
 210   struct external_exec swapped_hdr;
 211
 212   exec_hdr (abfd)->a_info = BMAGIC;
 213
 214   exec_hdr (abfd)->a_text = obj_textsec (abfd)->_raw_size;
 215   exec_hdr (abfd)->a_data = obj_datasec (abfd)->_raw_size;
 216   exec_hdr (abfd)->a_bss = obj_bsssec (abfd)->_raw_size;
 217   exec_hdr (abfd)->a_syms = bfd_get_symcount (abfd) * sizeof (struct nlist);
 218   exec_hdr (abfd)->a_entry = bfd_get_start_address (abfd);
 219   exec_hdr (abfd)->a_trsize = ((obj_textsec (abfd)->reloc_count) *
 220                                sizeof (struct relocation_info));
 221   exec_hdr (abfd)->a_drsize = ((obj_datasec (abfd)->reloc_count) *
 222                                sizeof (struct relocation_info));
 223
 224   exec_hdr (abfd)->a_talign = obj_textsec (abfd)->alignment_power;
 225   exec_hdr (abfd)->a_dalign = obj_datasec (abfd)->alignment_power;
 226   exec_hdr (abfd)->a_balign = obj_bsssec (abfd)->alignment_power;
 227
 228   exec_hdr (abfd)->a_tload = obj_textsec (abfd)->vma;
 229   exec_hdr (abfd)->a_dload = obj_datasec (abfd)->vma;
 230
 231   bout_swap_exec_header_out (abfd, exec_hdr (abfd), &swapped_hdr);
 232
 233   bfd_seek (abfd, (file_ptr) 0, SEEK_SET);
 234   bfd_write ((PTR) &swapped_hdr, 1, EXEC_BYTES_SIZE, abfd);
 235
 236   /* Now write out reloc info, followed by syms and strings */
 237   if (bfd_get_symcount (abfd) != 0)
 238     {
 239       bfd_seek (abfd, (file_ptr)(N_SYMOFF(*exec_hdr(abfd))), SEEK_SET);
 240
 241       if (! aout_32_write_syms (abfd))
 242         return false;
 243
 244       bfd_seek (abfd, (file_ptr)(N_TROFF(*exec_hdr(abfd))), SEEK_SET);
 245
 246       if (!b_out_squirt_out_relocs (abfd, obj_textsec (abfd))) return false;
 247       bfd_seek (abfd, (file_ptr)(N_DROFF(*exec_hdr(abfd))), SEEK_SET);
 248
 249       if (!b_out_squirt_out_relocs (abfd, obj_datasec (abfd))) return false;
 250     }
 251   return true;
 252 }
 253 \f
 254 static boolean
 255 os9k_set_section_contents (abfd, section, location, offset, count)
 256      bfd *abfd;
 257      sec_ptr section;
 258      unsigned char *location;
 259      file_ptr offset;
 260       int count;
 261 {
 262
 263   if (abfd->output_has_begun == false) { /* set by bfd.c handler */
 264     if ((obj_textsec (abfd) == NULL) || (obj_datasec (abfd) == NULL) /*||
 265         (obj_textsec (abfd)->_cooked_size == 0) || (obj_datasec (abfd)->_cooked_size == 0)*/) {
 266       bfd_error = invalid_operation;
 267       return false;
 268     }
 269
 270     obj_textsec (abfd)->filepos = sizeof(struct internal_exec);
 271     obj_datasec(abfd)->filepos = obj_textsec(abfd)->filepos
 272                                  +  obj_textsec (abfd)->_raw_size;
 273
 274   }
 275   /* regardless, once we know what we're doing, we might as well get going */
 276   bfd_seek (abfd, section->filepos + offset, SEEK_SET);
 277
 278   if (count != 0) {
 279     return (bfd_write ((PTR)location, 1, count, abfd) == count) ?true:false;
 280   }
 281   return true;
 282 }
 283 #endif 0
 284
 285 static int
 286 DEFUN(os9k_sizeof_headers,(ignore_abfd, ignore),
 287       bfd *ignore_abfd AND
 288       boolean ignore)
 289 {
 290   return sizeof(struct internal_exec);
 291 }
 292
 293
 294 /***********************************************************************/
 295
 296 /* We don't have core files.  */
 297 #define aout_32_core_file_failing_command _bfd_dummy_core_file_failing_command
 298 #define aout_32_core_file_failing_signal _bfd_dummy_core_file_failing_signal
 299 #define aout_32_core_file_matches_executable_p  \
 300                                 _bfd_dummy_core_file_matches_executable_p
 301
 302 /* We use BSD-Unix generic archive files.  */
 303 #define aout_32_openr_next_archived_file        bfd_generic_openr_next_archived_file
 304 #define aout_32_generic_stat_arch_elt   bfd_generic_stat_arch_elt
 305 #define aout_32_slurp_armap             bfd_slurp_bsd_armap
 306 #define aout_32_slurp_extended_name_table       _bfd_slurp_extended_name_table
 307 #define aout_32_write_armap             bsd_write_armap
 308 #define aout_32_truncate_arname         bfd_bsd_truncate_arname
 309
 310 /* We override these routines from the usual a.out file routines.  */
 311 #define aout_32_canonicalize_reloc      bfd_canonicalize_reloc
 312 #define aout_32_get_reloc_upper_bound   bfd_get_reloc_upper_bound
 313 #define aout_32_set_section_contents    bfd_set_section_contents
 314 #define aout_32_set_arch_mach           bfd_default_set_arch_mach
 315 #define aout_32_sizeof_headers          os9k_sizeof_headers
 316
 317 #define aout_32_bfd_debug_info_start            bfd_void
 318 #define aout_32_bfd_debug_info_end              bfd_void
 319 #define aout_32_bfd_debug_info_accumulate       (PROTO(void,(*),(bfd*, struct sec *))) bfd_void
 320
 321 #define aout_32_bfd_make_debug_symbol \
 322   ((asymbol *(*) PARAMS ((bfd *, void *, unsigned long))) bfd_nullvoidptr)
 323 #define aout_32_bfd_link_hash_table_create _bfd_generic_link_hash_table_create
 324 #define aout_32_bfd_link_add_symbols _bfd_generic_link_add_symbols
 325 #define aout_32_bfd_final_link _bfd_generic_final_link
 326 #define aout_32_bfd_get_relocated_section_contents  bfd_generic_get_relocated_section_contents
 327 #define aout_32_bfd_relax_section                   bfd_generic_relax_section
 328 #define aout_32_bfd_reloc_type_lookup \
 329   ((CONST struct reloc_howto_struct *(*) PARAMS \
 330 ((bfd *, bfd_reloc_code_real_type))) bfd_nullvoidptr)
 331
 332 bfd_target i386os9k_vec =
 333 {
 334   "i386os9k",                           /* name */
 335   bfd_target_os9k_flavour,
 336   false,                                /* data byte order is little */
 337   false,                                /* hdr byte order is big */
 338   (HAS_RELOC | EXEC_P | WP_TEXT),       /* object flags */
 339   (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD ), /* section flags */
 340   0,                                    /* symbol leading char */
 341   ' ',                                  /* ar_pad_char */
 342   16,                                   /* ar_max_namelen */
 343   2,                                    /* minumum alignment power */
 344
 345   bfd_getl64, bfd_getl_signed_64, bfd_putl64,
 346      bfd_getl32, bfd_getl_signed_32, bfd_putl32,
 347      bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
 348   bfd_getl64, bfd_getl_signed_64, bfd_putl64,
 349      bfd_getl32, bfd_getl_signed_32, bfd_putl32,
 350      bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */
 351  {_bfd_dummy_target, os9k_object_p, /* bfd_check_format */
 352    bfd_generic_archive_p, _bfd_dummy_target},
 353  {bfd_false, bfd_false, /* bfd_set_format */
 354    _bfd_generic_mkarchive, bfd_false},
 355  {bfd_false, bfd_false, /* bfd_write_contents */
 356    _bfd_write_archive_contents, bfd_false},
 357
 358   JUMP_TABLE(aout_32),
 359   (PTR) 0,
 360 };
 361